<template>
	<view class="u-wrap">
		<!-- 导航 -->
		<view class="nav">
			<view class="delica-list"><text class="content" @click="multiple(0)">推荐</text></view>
			<!-- 工厂类别筛选 -->
			<view class="delica-list" @click="multiple(1)">
				<text>距离</text>
				<u-icon :name="[cindex == 1 ? 'arrow-up-fill' : 'arrow-down-fill']" color="#a8a8a8" size="28"></u-icon>
			</view>
			<!-- 地区筛选 -->
			<view class="delica-list" @click="multiple(2)">
				<text>{{ leixin }}</text>
				<u-icon :name="[cindex == 2 ? 'arrow-up-fill' : 'arrow-down-fill']" color="#a8a8a8" size="28"></u-icon>
			</view>
			<!-- 多选 -->
			<view class="delica-list" @click="multiple(3)"><text>有券</text></view>
		</view>
		<!-- 分类 -->
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view
					v-for="(item, index) in categoryList"
					:key="index"
					class="u-tab-item"
					:class="[current == index ? 'u-tab-item-active' : '']"
					:data-current="index"
					@tap.stop="swichMenu(index)"
				>
					<text class="u-line-1">{{ item.explanation }}</text>
				</view>
			</scroll-view>
			<block v-for="(item, index) in categoryList" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current == index">
					<view class="page-view">
						<view class="class-item">
							<view class="item-title">
								<text>{{ item.explanation }}</text>
							</view>
							<view class="item-container">
								<view
									class="thumb-box"
									v-for="(item1, index1) in item.categorys"
									:key="index1"
									@click="jump('/pages/home/index', item1.icon_id)"
								>
									<!-- <image class="item-menu-image" :src="item1.icon" mode=""></image> -->
									<view class="item-menu-name">{{ item1.name }}</view>
								</view>
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
const app = getApp();
export default {
	data() {
		return {
			scrollTop: 0, //tab标题的滚动条位置
			current: 0, // 预设当前项的值
			menuHeight: 0, // 左边菜单的高度
			menuItemHeight: 0, // 左边菜单item的高度
			categoryList: [],

			cindex: -1,
			leixin: '类型',
			list: [],
			options1: [],
			options2: [],
		};
	},
	onLoad() {
		var that = this;
		app.globalData.api.getCategory().then(res => {
			that.categoryList = res.resultObj;
		});
	},
	computed: {},
	methods: {
		jump(url, categoryId) {
			console.log('url :>> ', url);
			console.log('categoryId :>> ', categoryId);
			app.globalData.categoryId = categoryId;
			uni.switchTab({
				url,
			});
		},
		multiple(num) {
			this.cindex = num;
		},
		tagClick(index) {
			this.list[index].active = !this.list[index].active;
		},
		change(index) {
			this.$u.toast(`点击了第${index}项`);
		},
		closeDropdown() {
			this.$refs.uDropdown.close();
		},

		getImg() {
			return Math.floor(Math.random() * 35);
		},
		// 点击左边的栏目切换
		async swichMenu(index) {
			if (index == this.current) return;
			this.current = index;
			// 如果为0，意味着尚未初始化
			if (this.menuHeight == 0 || this.menuItemHeight == 0) {
				await this.getElRect('menu-scroll-view', 'menuHeight');
				await this.getElRect('u-tab-item', 'menuItemHeight');
			}
			// 将菜单菜单活动item垂直居中
			this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
		},
		// 获取一个目标元素的高度
		getElRect(elClass, dataVal) {
			new Promise((resolve, reject) => {
				const query = uni.createSelectorQuery().in(this);
				query
					.select('.' + elClass)
					.fields({ size: true }, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					})
					.exec();
			});
		},
	},
};
</script>

<style lang="scss" scoped>
// 导航
.nav {
	display: flex;
	justify-content: space-between;
	background-color: #ffffff;
	width: 100%;
	padding: 40rpx 60rpx 30rpx;
	border-bottom: 1upx solid #f8f8f8;
}
.delica-list {
	display: flex;
	align-items: center;
	color: #7c7c7c;

	text {
		margin-right: 6rpx;
	}
}

// 筛选
.slot-content {
	background-color: #ffffff;
	padding: 24rpx;

	.item-box {
		margin-bottom: 50rpx;
		display: flex;
		flex-wrap: wrap;
		justify-content: space-between;

		.item {
			border: 1px solid $u-type-primary;
			color: $u-type-primary;
			padding: 8rpx 40rpx;
			border-radius: 100rpx;
			margin-top: 30rpx;
		}

		.active {
			color: #ffffff;
			background-color: $u-type-primary;
		}
	}
}
// 分类
.u-wrap {
	height: calc(100vh);
	/* #ifdef H5 */
	height: calc(100vh - var(--window-top));
	/* #endif */
	display: flex;
	flex-direction: column;
}
.u-menu-wrap {
	flex: 1;
	display: flex;
	overflow: hidden;
}

.u-tab-item {
	height: 110rpx;
	background: #f6f6f6;
	box-sizing: border-box;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 26rpx;
	color: #444;
	font-weight: 400;
	line-height: 1;
}

.u-tab-item-active {
	position: relative;
	color: #000;
	font-size: 30rpx;
	font-weight: 600;
	background: #fff;
}

.u-tab-item-active::before {
	content: '';
	position: absolute;
	border-left: 4px solid $u-type-primary;
	height: 32rpx;
	left: 0;
	top: 39rpx;
}

.u-tab-view {
	width: 360rpx;
	height: 100%;
}

.right-box {
	background-color: rgb(250, 250, 250);
}

.page-view {
	padding: 16rpx;
}

.class-item {
	margin-bottom: 30rpx;
	background-color: #fff;
	padding: 16rpx;
	border-radius: 8rpx;
}

.item-title {
	font-size: 26rpx;
	color: $u-main-color;
	font-weight: bold;
}

.item-menu-name {
	height: 50rpx;
	line-height: 50rpx;
	font-weight: normal;
	font-size: 24rpx;
	color: $u-main-color;
}
.item-menu-name:hover {
	color: #f75b13;
}

.item-container {
	display: flex;
	flex-direction: column;
	// flex-wrap: wrap;
}

.thumb-box {
	width: 33.333333%;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	margin-top: 20rpx;
}

.item-menu-image {
	width: 120rpx;
	height: 120rpx;
}
</style>
